SOURCE: U.S. Census Bureau, Current Population Reports, Estimates of the population of the United States by single years of age, color, and sex: 1900 to 1959 (Series P-25, No. 311); Estimates of the population of the United States, by age, sex, and race: April 1, 1960, to July 1, 1973 (Series P-25, No. 519); Preliminary estimates of the population of the United States by age, sex, and race: 1970 to 1981 (Series P-25, No. 917); and Intercensal estimates for 1980–1989, 1990–1999, and 2000–2009. The data for 2010 to 2015 are based on the population estimates released for July 1, 2015. Data beyond 2015 are derived from the national population projections released in December 2014.